[00:12] other day. Hello close personal showbiz friend of mine, Michael Stevens from Vsauce. How are you? It was a video call and as often happens, we got onto the subject of the Assassin's Teapot. And at one point Michael said, "Wouldn't it be
[00:25] amazing if there was a water bottle that worked in the same way?" more we realized this is just something that has to exist. Like the Assassin's Teapot is such a cool demonstration of fluid dynamics, but if you ever wanted
[00:39] to show it to your friends when you're out and about, the teapot is just a terrible form factor. It's going to spill all over your bag or whatever. Or to keep your water and electrolytes separate, the teapot's just a nightmare.
[00:53] get you through dinner. More red? More red? Yeah.
[01:11] I'll refill it. So this is the exciting part. This is the big announcement, right? For the first time I can present to you, available for pre-order, the Assassin's Water Bottle by Steve
[01:23] Mould and Michael Stevens. Link in description to place your pre-order today. How cool is that? This is a 3D printed prototype. The final product will be made of premium durable materials. Like the bottle will
[01:36] be crystal clear. It'll have a design on it and you just know that that design's going to be jam-packed full of Easter eggs. But maybe you're wondering, like liquids? Well, I assume it's just the same
[01:49] Well, it's actually the same mechanism as the teapot. So in the Assassin's Teapot, you've got these two chambers and they both lead up to the end of the spout. And each chamber has an additional hole for air to get in so
[02:02] that liquid can flow out. But if you cover one of those holes, it stops that chamber from being able to empty because of surface tension and atmospheric that because that's in the original video, link in the description. And so
[02:15] we've got the same thing going on here. You've got these two chambers, and they that on the underside of the cap, there's actually a set of small holes there, four holes for each chamber. Then you've got these two holes here, which
[02:28] are equivalent to these two holes on the Assassin's Teapot. And just like the Assassin's Teapot, you choose which drink you want by putting your finger over the appropriate hole so that only the other liquid can get out. Or if you
[02:40] leave both holes uncovered, you get the two liquids mixed together, so you can even have a rosé. You know rosé isn't just red and white I'm okay. Ah, the null drink.
[02:54] Here we go. Pre-orders open for the next two weeks, and it's a limited run, so once we've got the numbers, that's how many we'll make. To get yours, check out the link in the description.
[03:06] The cool thing about the Assassin's water bottle is you've got this transparent vessel, but then you also get this opaque sleeve with it, like a get this opaque sleeve with it, like a cozy that um covers up the transparent
[03:21] on it as well, again full of mathematical history and stuff like that. But it means you can demonstrate the effect and then also reveal how it's with the Assassin's Teapot, I had to make a separate transparent version. At
[03:34] from the same problem as the Teapot, it's no good in transit. So we need some way to cover these holes when it's not in use. In this prototype, you've got one piece of rubber that makes up the strap that holds the lid, but also has
[03:48] when you're not using it. Another benefit of this design as well is I can stop at just one of the holes and then I'm going to get just one side all the time. So, for the practical uses as well, this is really handy. Like if I'm
[04:01] carrying orange juice and water, I can switch between the two without having to some really surprising engineering challenges when you go from a water bottle that has one compartment to one that has two compartments. And during
[04:13] the design process, we realized that the Assassin's Teapot is just one example of a class of magic tricks, usually referred to in general as inexhaustible designs to draw inspiration from. The earliest known example being one from a
[04:27] 1635 publication where the vessel in question was shaped like a barrel. But if you wanted to buy one of these magic tricks today, you might end up paying over a hundred dollars. But by doing this limited run using large-scale
[04:39] able to get the price down to something closer to what you might pay for a happy about. Check out the link in the description for the different price So, the biggest challenge we faced was
[04:53] airtight. Like if you think about how you screw the lid onto a traditional water bottle, see this surface is pressed against this surface in here as the lid is screwed down. But look, we need to get a good seal across the
[05:07] partitioning wall as well. So, we need something like silicone to press down on there. Here's the issue though, if we're screwing the lid on, that silicone is going to be scraping against the partition. I had the idea of a design
[05:20] like a mason jar where the lid flips down and then you have a little latch team that we've been working with, you know, they're brilliant at figuring out how a particular design idea might turn into a manufacturing challenge. They
[05:34] realized that this flip lid thing was going to cause problems with other aspects of the design, but brilliantly there is another type of mason jar. I don't know if you've ever seen this type, but it's basically the lid of a
[05:47] jar except it's in two parts. You have the disc that goes down onto the jar, and then the screw part is like a separate ring. So, look, I can make a that's what we've got here. The gasket lines up with the inner chambers, and
[06:01] the ring holds it down. There are a couple of different options to choose printed on the bottle. My favorite is this one. It features markings for different volumes of liquid, and next to those markings are molecules. And on the
[06:18] other side, there's different amounts of Steves, like one killer Steve or one mega Steve, for example. Perhaps you can work out what that means, but it's meant the Assassin's water bottle. But, it's all explained in the booklet. Maybe I'll
[06:31] But, we also had some fun with the cozy probably this one. If you've ever played the classic arcade game Asteroids, the left-hand side of the screen, it will come back on the right-hand side of
[06:44] the screen. So, look, it's these two edges of the universe are joined thing around and actually join them together? Look, it forms a cylinder. In other words, the Asteroids universe is topologically equivalent to a cylinder.
[06:57] topologically equivalent to a cylinder. So, it's the perfect thing to print on a water bottle. Hold on. If you fly off the bottom in Asteroids, you actually come in from the top. So,
[07:09] toroidal. That's true, but like where would I put the spout on a donut-shaped water bottle? There are three other cozy designs available, all with mathematical backstories. And there
[07:21] are engineering posters with Easter eggs about chirality and stuff. If you get the Steve poster and the Michael poster, they combine into one larger poster, and going on, basically. So, click the link in the description to find out more and
[07:34] pre-order your limited-edition Steve Mould Vsauce crossover Assassin's water it. Okay? So the estrogenous is technically steroidal.
[07:48] All right. Yeah. Yeah. Let's do that again.